Dflybldr

Ok. So I went to visit N5739J in the hospital, I mean Mooney service center today and asked to see the MB4413 relay. It looked bad with signs of overheating on the can (blistered paint). I put it on the bench and it passed continuity and isolation checks. I also applied 12vdc to the coil and all 3 contacts opened as expected. I also checked the contact resistance and they all homed out the same. The socket also passed visual inspection. I will load test the old battery tomorrow and make sure all connections are clean and tight. I would prefer to figure this out before bypassing with a switch. Thanks for the clues. BTW the San Diego Crownair Mooney service center has been very understanding of a Mooney owner that wants to know and understand their aircraft.

Has anyone installed the 940074-501 retrofit kit? My MB4413 relay shows serious signs of abuse. It's strange that I cannot find a SB or SI for it's installation. Only the diode. The MB4413 is made of unobtainium, and the substitute relays in the kit are on back order. :-(

Thanks Yetti, This is exactly what I was looking for. I will have them locate and check the diode. A failed diode would not block the start position from keeping the relay powered open and allow the avionics relay to close (i think). Anyway, It help to point these guys in the right direction and keep them focused. I cleaned, gapped, and rotated by own plugs this weekend and felt pretty darn good about it. I have completed my transition training and hope to solo this weekend.

Thanks. That's how i understood how it works. I will install the ACS concord RG battery I just bought and make sure I don't' have high resistance connections before I pay them to tell me that's what I need. existing battery is 3.5 years old and sat for a while. Thanks for the quick reply.

Hello everyone. Just purchased a 1984 M20j. During the cranking phase before firing and when I stop pushing the key in, I hear static in the speakers and see the radio displays flicker/com-on. All this stops after I let go of the key and the radios come on normally when I turn on the radio/avionics master. Does anyone else experience this? Is it normal? Is it a problem? My Mooney service center is convinced it's bad and it needs to charge me 95$ per hours to trouble shoot it that fix it. I had the line boys/girls hook up ground power, cranked it, and saw the same thing. Does this rule out the battery? Thanks in advance for you responses. N5739J

FWIW, still intersted in a standalone dowloader, but I am able to download my UBG-16 cht/egt data recorded on the attached MUX-8A on my MAC Air. I am using a Radio Shack Model: 26-949 | Catalog #: 26-949 Gigaware® 6-ft. USB-A to Serial Cable. $37 Get the MAC OSX driver here free. Run it on the MAC. http://sourceforge.net/projects/osx-pl2303/files/osx-pl2303/0.3.1/ Then I am using VMware Fusion ($50 bucks I think but you can try a free trial version to prove it works) Only catch is you have to buy (have) a real licensed version of XP SP2 or Windows 7 to run the DRS-1 downloder from Elctronics International. I happened to have an old XP Pro SP2 disk with a key so I saved $199 or so there. You can also probably use boot camp to load XP or 7 on a seperate partition on the MAC but I liked the ability to drap and drop the csv file onto the MAC desktop and run Excel on the MAC without re-booting. (BTW, you have to fix the worksheet name on the lower "tab" to get rid of the "." on the name that came from the ".csv" file name, or you get an error when you try and graph. This was using office 2011 on the MAC). Also, I am using "remote disk" on the MAC air connected to the iMac since the MAC does not have a CD. Anyway, I had to create COM1, 2, and 3 serial ports in Fusion with the XP dest top shutdown, not just susspended. Then I used Comm 3 port when running the DRS-1 downloader. A bit of trial and error here so you comm ports may vary. The processing bar never comes back and says it's done like in the instructions, but it seems to get all the data. BTW, this setup also works on the DYNON-D10A configuration software. Hope this helps.